Getting off topic a bit, but we are experiencing the same thing with noise at our range. Housing development has been creeping into the areas surrounding the range, and the home owners are complaining about the noise - the range has been here for 80-90 years I believe. Barriers have been put in, by the range, to minimise the noise leaving the site.

What gets me is that there are fellow shooters at the range who complain about the noise of the bigger rifles and wish that they weren't allowed - what the....? It's a rifle range for crying out loud - it's gonna be noisy! They don't seem to understand the idea of "united we stand, divided we fall" - who's side are they on? Where will it lead to - first they ban the big bores, then all centrefires, then 22s?